MAGNETIC FIELD SHIELDING CALCULATOR

Magnetic Field Shielding Effectiveness — Bi/Bo
Magnetic Field Shielding Effectiveness Calculator
SE(dB) = 20 · log10(Bi / Bo)

Inputs

Use consistent measurement conditions for Bi (before shielding) and Bo (after shielding). Supported units: Tesla (T), Gauss (G), microtesla (µT), milligauss (mG).

Results

SE (dB)
—
Bi / Bo
—
Reduction
—
Converted (Tesla): — (Bi), — (Bo)

    Inverse calculator (compute Bo from SE and Bi)

    Computed Bo = Bi / 10^(SE/20)
    Computed Bo
    —
    Built for quick field calculations. Validate results with proper instrumentation.

    NOTE: SE(dB) = 20 · log₁₀(Bi / Bo) is unit-agnostic, meaning you can use any unit of magnetic flux density (Tesla, Gauss, microtesla, milligauss, etc.) as long as Bi and Bo are expressed in the same unit.

    Practical choices:
  • µT (microtesla): common in scientific/engineering use (SI unit, Tesla).
  • mG (milligauss): often used in EMF safety standards and environmental measurements.
  • T or G: useful if you’re working with stronger fields (industrial or lab magnets).
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